How can the sailor and the girl in part 3 see forever's stand (that giant cargo ship)

[wintry osprey]

they're not stand user, and only stand user see other stand, so how can they see it?

[sweet cradle]

Strength (the stand/ship) is one that can bind itself to a much smaller ship and transform itself into a massive freighter. Since it's a bound stand (stands that bind to objects), it can be seen by non-stand users.

[wintry osprey]

ohhh so its the same case with wheel of fortune isnt it?

[solid solstice]

@wintry osprey, your Stand Rank is now 1!

[steel zinc]

yeah

some stands have different properties